/*
 * Copyright 2019-2025 the original author or authors.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * https://www.apache.org/licenses/LICENSE-2.0
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.iiifi.kite.cloud.feign;

import org.springframework.cglib.proxy.Enhancer;

import feign.Target;
import feign.hystrix.FallbackFactory;
import lombok.AllArgsConstructor;
import lombok.extern.slf4j.Slf4j;

/**
 * 默认 Fallback，避免写过多fallback类
 *
 * @param <T> 泛型标记
 *
 * @author kite@iiifi.com 花朝
 */
@Slf4j(topic = "KiteFallback")
@AllArgsConstructor
public final class KiteFallbackFactory<T> implements FallbackFactory<T> {

    private final Target<T> target;

    @Override
    @SuppressWarnings("unchecked")
    public T create(Throwable cause) {
        final Class<T> targetType = target.type();
        final String targetName = target.name();
        Enhancer enhancer = new Enhancer();
        enhancer.setSuperclass(targetType);
        enhancer.setUseCache(true);
        enhancer.setCallback(new KiteFeignFallback<>(targetType, targetName, cause));
        return (T) enhancer.create();
    }
}
